Reservoir release valve



July 28, 1931. J. c'. MccuNE I RESERVOIR RELEASE VALVE Filed Jan. 1o. 192:1;A

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|NVENTOR JOSEPH C.MoCUNE ATTORNEY Patented July 28,` 1931 l UNirE'D STATES PATENT lorrlcu *A .iosErH c; MecUNn, oF nnenwoon, PENNSYLVANIA, AssIGNoR rro THE WnsrrNG- i House ein ABRAKE co-MPANY, or WILMERDING, PENNSYLVANIA, n CORPORATION K OF f PENNSYLVANIA RESERVOIR RELEASE VALVE Application filed January 10, 1929. Serial No. 331,478.

This invention'relates to release valve de# vices, and more particularly to a release Valve device for releasing fluid under pressure fromy k the auxiliary reservoir of a, fluid pressure 7 V5 brake'system.

,l One object ofmy invention is to provide a releaseV valve device having different positions, in one of which Huid is kreleased from the Vauxiliary reservoir atone rate and in another position of which, fluid is released from the auxiliary reservoir at a dil'erent rate.

' Other 'objects andy advantages will appear in the following more detailed description v,ot the invention. f

11n the raccompanying drawings, Fig. 1 is a` central sectional viewof a release valve device embodying` my invention and shown applied to an auxiliary reservoir; yand Fig. 2 is a vplan view of the release valve device. y

It is sometimes desirable to release fluid ,from the auxiliary reservoir at a rapid rate,

as in case a car is cut froml a train, and` it 1s Vnecessary to releasethe brakes on that car. Atrother times it is desirable to effect a grad- -ual release ofV fluid from the auxiliary reservoir', 'as at'the headend of a train, in thecase of an overchargedfreservoir, and it becomes necessary to. reduce' the auxiliary reservoir pressurebelow'brake pipe pressure in order toV release the brakes.

According to my; invention, the release valve device may comprise a threaded nipple section 1, adapted to be screwed into an auxiliary reservoir 2, and a casing section 3, having screw-threaded engagement with vthe'nipple section.

` Disposed in a central cavity 4 of the casing 3 is a release valve 5 adapted. to engage a seat rib 6. The valve is carried by astem 7 which is guided in a central boreof the casing 3 and yhas'a disk 8 secured at its upper end by a pin 9. n

The valve is provided on its lower face i with lugs 10, which are cut away to provide a seat for the end of a coil spring 11, the spring extending into a central cavity 12 of the nipple section 1 and having its lower end engaging a seat on the nipple. The valve 5 is also provided with peripheral guide lugs 13 to maintain the valve in axial alinement.

The stem 7 is provided adjacent to the valve 5 with an annular section 14 of greater diameter than the stem, the section 14 extending into the port opening 15, which isy controlled bythe'valve 5. f y

For operating the valve stem 7, operating levers 1,6 and 17 are provided. The lever 16 is is pivotally mounted on a pin 18 carried by lugs 19 of the casing 3 and is provided with a ng'er 20, the end of which engages the disk. The'lever 17 is pivotally mounted on a pin 21 carried by lugs 22 and is provided withy a finger 23 having forked end portions 24 f adapted to straddle the finger 2O and engage the disk 8.

Surrounding the coil spring 11 is another coil spring 25 which has one end in engagement with a seat in the the nipple section 1 and the upper end in engagement with a movf able disk 26, mounted in an annular recess in the casing section 3.

In operation, upon movement of either the lever 16 or 17, the disk 8 is operated to depress the stem 7. 'If it is desired to release fluid fromthe auxiliary reservoir at a slow rate, the lever is operated to move the valve 5 against the pressure of spring 11, until the lugs 10 engage the disk 26. This defines the position, sincev further downward movement of the valve will be resisted by the added pressure of spring 25.

When the lugs 10 engage the disk 26, the enlarged section 14 still extends into the port opening 15, sothat the rate oi flow from the auxiliary reservoir is limited by the flow area between the section 14 andthe cylindrical wall of the port opening 15.l Fluid under pressure then flows from the auxiliary reservoir through the port opening 15 to the atmosphere by way of the atmosphericpassage 27.

It it is desired to release fluid from the aux-` iliary reservoir at a rapid rate, one of the levers 16 or 17 is operated, so as to move the stem 7 until the disk 26 is moved, against the resistance of spring 25, to a seat on the nipple section 1. In this position, the valve 5 is shifted, so that the portion 111 does not extend into the port opening 15, and consequently the rate of How of fluid from the auxiliary reservoir is increased.

The lugs 10 are spaced apart to provide port area to insure ample venting capacity. When the valve 5 is moved down, the spring 11 may be compressed practically solid, and

in such cases, air vented from the auxiliary reservoir can freelyflow out through the pori'J areas providedbythelugs .10.

While one illustrative embodiment lofthe invention has been described in detail, it is isy restricted and another open position whichthe release of. fluid is at a more rapid rate, of a yielding stop for opposing movement of said valve from. its first to its second mentioned position and meansfor actuating said valve., Y y

` In a fluid pressure release valve device,

Vthe.combination with a release valve having an open position in which the release offlnid is restricted and another` open position Vin Vwhich the release of fluid .is ata more rapid rate, oi" yielding means for'y opposing movement of saidvalve to its first ,mentioned position,"an additional yielding means-.for opposing movementof said valve from its vfirst to .its second mentioned position, and. means for actuating said valve. y

- 3. In a fluid pressure release valve device, the combination with a release valve having an open position in which the release of iuid is ,restricted and another open position in which they release of iluid is at a more rapid rate, of av spring opposing movement of said valve to its first mentoned position, a second spring opposing movement of said valve to its second mentioned position, and means for.

actuating said valve. y y v 1l. In afiuid pressure release valve device,

ythe combination with Va release valve having an open position in which the release of fluid is restricted and another open position in which the release of fluid is at amore rapid rate, of a movable member adapted to be engaged by said valve upon movement to its iii stA mentioned position, a spring for opposing movement of said inembenand means 'for actuating said valve.

5. The combination with an yauxiliary reservoir of a fluid pressure brake system, of release valve having one position in which fluid is released from the auxiliary reservoir at a restricted rate and another position in which fluid is released from the auxiliary reservoir .at a more rapid rate, a yielding stop means for defining the first mentioned position of said valve, and means for actuating said valve.

6. In a fluid pressure release valve device, the combination with a release valve for controlling a release port and having a portion extending into said port for restricting the flow area of said port, said valve being mov- `release of uid is at a more rapid rate, of a movable member, `projections on said valve ior engaging said "member upon movement of said .valve toits lirst mentioned position,

ya spring for opposing movement of ysaid member, and means for actuating said valve. 8. Ina fluid pressure release valve device, the combination with a release valve and a 'stem carried said valve,`of a lever, a

finger operated by said lever and 'engaging said stem, a second lever, and a finger having forked v'ends engaging said stem and strad.

dling theend of the other finger and Koper@ u ated by said second lever. Y

9.V In a fluid pressure release valve device, the combination with a release valve' and meansrfor operating said valve, of a spring for opposing movement of said valve and surrcunding a passageway through whichfiuid is vented by. the operation of lthe release valve,-'and openings intermediate the spring and the valve for permitting the venting of' fluid. Y, 4

10. In a fluid pressure release valve. device, the combination with arelease valve and means for operating said valve, of a spring for opposing movement of said valve and surrounding a passageway through` which l" fiuid is vented by the operation of the release valve and openings intermediate the spring and the valve for permitting'the venting of fluid independently of the spring.

l1. In a fluid pressure release valve device, s t

the .combination with a release 4valve and a coil spring opposing movement of saidv valve Yand surrounding a passagewayA through which yfluid is vented byV operation of the release valve, of means associated with said valve and providing port openings independent of the spring for permitting the flow of fluid through said passageway. i

In testimony whereof I have hereunto set my hand, this 7th day of January,l929.

1 v JOSEPH C. MCCUNE. 

